dratiniest sand box

Knitting needles or a crochet hook that can knit/crochet without yarn; however, this yarn is pulled from clothing being worn by someone in the vicinity of the user. Material is preferentially pulled from everyone other than the user if possible. The source of yarn can not be chosen and the method of determination is unknown.

When the tool is picked up with the intent of use, yarn appears already cast-on onto the implement. The leading yarn is generally about a foot long, and appears to come out of any nearby yarn bowl or storage container for yarn, or between couch cushions, etc. If nothing like that is available, the end disappears in the air, tho it floats conveniently for the user.
or there is no yarn ball or collection of yarn as a source, save an approx. meter long thread appearing out of nowhere, usually from a yarn bowl if one is nearby.

Found when an old lady in a nursing home was knitting things for charity, unaware that she was declothing a significant portion of the nursing home where she resides. Something something "magic needles" etc. being excited about saving money on yarn (probably wont make it in if I ever decide to actually write this)

Class B amnestics distributed via daily pills of affected residents. Low effort old people joke. I see that last paragraph being one of those "researcher notes" that were popular on older SCPs, but that became strongly discouraged later. It sort of sounded like that wasn't the case anymore when I read the site rules, though.

Oh well! Excited to maybe ask for input on this idea. I wonder if there is something similar already> I also wonder if this is almost a joke SCP.

Safe. Containment procedures: put it in a locker.